condition mean min max ZT0-3 33.368172 33.368172 33.368172 ZT4-7 32.888807 32.888807 32.888807 ZT8-11 34.383698 34.383698 34.383698 ZT12-15 269.74883 269.74883 269.74883 ZT16-19 31.1985415 31.1985415 31.1985415 ZT20-23 73.46762050000001 73.46762050000001 73.46762050000001